I couldn't care less what people do with all the stuff I put on Olio etc.
It annoys me a lot more that people give away stuff for free "to help those less fortunate" just so that they can feel good about themselves for "helping the poor".
If im giving it away, it's cos I can't be bothered to sell it. Richard Branson himself could turn up to collect my old hoover and I'd still give it to him.